1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN

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The MAX8808X/MAX8808Y/MAX8808Z intelligent, stand-alone constant-current/constant-voltage (CCCV), thermally regulated linear chargers are designed for charging a single-cell lithium-ion (Li+) battery. The MAX8808X/MAX8808Y/MAX8808Z integrate the current-sense circuit, MOS pass element, and thermal-regulation circuitry, and eliminate the reverse-blocking Schottky diode to create the simplest and smallest charging solution for handheld equipment.

The MAX8808X functions as a stand-alone charger to control the charging sequence from the prequalification state through fast-charge, top-off charge, and fullcharge indication. The MAX8808Y and MAX8808Z eliminate the prequalification state to allow startup into a load without a battery. Proprietary thermal-regulation circuitry limits the die temperature when fast-charging or while exposed to high ambient temperatures, allowing maximum charging current without damaging the IC.

The MAX8808X/MAX8808Y/MAX8808Z achieve high flexibility by providing an adjustable fast-charge current with an external resistor. Other features include a battery charging-status indicator (active-low CHG), an active-low control input (EN) for the MAX8808X and MAX8808Z (active-high control input for the MAX8808Y), and an active-low input power-source detection output (active-low ACOK).

The MAX8808X/MAX8808Y/MAX8808Z accept a +4.25V to +15V supply, but disable charging when the input voltage exceeds +7V to protect against unqualified or faulty AC adapters. The MAX8808X/MAX8808Y/MAX8808Z operate over the extended temperature range (-40°C to +85°C) and are available in a compact 8-pin thermally enhanced 2mm x 2mm TDFN package with 0.8mm (max) height.
MAX8808X, MAX8808Y, MAX8808Z: Typical Operating Circuit MAX8808X, MAX8808Y, MAX8808Z: Typical Operating Circuit Enlarge+

Key Features

  • Stand-Alone Linear 1-Cell Li+ Battery Charger
  • No External FET, Reverse Blocking Diode, or Current-Sense Resistor Required
  • Programmable Fast-Charge Current (1A max)
  • Proprietary Die Temperature Regulation Control (+115°C)
  • +4.25V to +15V Input Voltage Range with Input OVP Above +7V
  • Charge-Current Monitor for Fuel Gauging
  • Low Dropout Voltage—300mV at 500mA
  • Input Power-Source Detection Output (Active-Low ACOK) and Charge-Enable Input (Active-Low EN or EN)
  • Soft-Start Limits Inrush Current
  • Charge-Status Output (Active-Low CHG) for LED or Microprocessor (µP) Interface
  • Tiny 2mm x 2mm 8-Pin TDFN Package, 0.8mm (max) Height


  • Cell Phones/Cordless Phones
  • Charging Cradles and Docks
  • Digital Still Cameras and MP3 Players
  • Smartphones and PDAs
  • USB Appliances
Part NumberLithium Ion CellsProtected VIN
Charging VIN
Charge Rate Set byMax. ICHG
Charge TerminationCharge RegulationOper. Temp.
maxmaxSee Notes
MAX8808X 1156.5Resistor1External ControlLinear-40 to +85
$1.58 @1k
See All Battery Chargers (74)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX8808EVKIT: Evaluation Kit for the MAX8808

Technical Documents

Tutorial 4671 Improve Sensor Performance and SNR in Pulse Oximeter Designs

Quality and Environmental Data

Product Reliability Reports: MAX8808X.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Environmental Management System >


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